Improvement in the manufacture of white lead



UNITED STATES "PATENT OEEIoE.

CHARLES WV. DIVELLE, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN THE MANUFACTURE OF WHITE LEAD.

Specification forming part of Letters Patent No. 108,571, dated. October 25, 1870.

To all whom it may concern:

VBe it known that I, CHARLES W. DWELLE, of St. Louis, in the county of St. Louis and State of Missouri, have made .cert-ain new and useful Improvements in Processes for Manufacturing Vhite Lead and similar substances; land I do hereby declare the following to be a full and true description thereof, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

This invention relates, generally, to a construction of cistern, 4as an improvement to that described in the Letters Patent of the United States issued to me for improvements in the manufacture of white lead, bearin g date the 21st day of September, 1869, and being numbered 95,097.

In the use of the cistern constructed and arranged as described in my said Letters Patent, the coarser particles of Vlead frequently fill and choke the perforations of the pan, preventing the water-supply from reaching and wetting said carbonate received in the cistern, and thus the same would become inoperative and ineffective for one ofits principal purposes; also, the carbonate dust, escaping through the spaces of the falling water, would pass up the annular space formed between the rim of the pan and the cistern-wall, and find its exit through the space intervening between the fia-nge and pan. Said dust thus escaping, besides being a great wastage, would be in jurions t0 the health and difficult for proper manipulation.

wTo avoid said inconveniences, and, in general, to form an improved cistern, the nature of the improvement-s here presented is, first, in the construction of a cistern proper, consist ing of aninner and outer vessel or tl1bs,ar ranged one within the other, for receiving carbonate; and, secondly, in providing the interior tub with sliding screens or doors of wiregauze, or other perforated metal suitable, and arranging within said vessel an ordinary reaction water-wheel, or its equivalent, for the more perfect regulation and wetting the carbonate in its passage to the iinal water-tanks or settling-tubs.

To enable those herein skilled to make and use my said improved cistern, I will now more fully describe the same, referring to the accompanying Figure l as a perspective view, having parts of tubs removed to show interior construction of the same and as generally arranged when in use.

My improved cistern consists of the exterior vessel, A, and the interior vessel, B, constructed of any convenient form and material.

-Each of said vessels or tubs has concave bot- (known as the Barker 1nilI,) having its hol.

low shaft F turning freely in a cross-bearing, f, and resting upon apivot-step, f1, in manner usual.

The arms F I arrange, however, close to the top of the hollow shaft, so that the water escapin g at the arm ends dashes down the screens and sides of the tub B.

The cover G, secured to the top of the blast tub B in a manner to be readily disconnected, has the hinged doors H, to perlnit the operator to open and close the screendoors E.

To prevent the air from being vitiated, as

well as any undue loss of carbonate-d'ustwhich passes into the exterior vessel, A, I have arranged the same with rim-flan ges 11-in which a flannel, It', or other cloth material, may be inserted, so as to entirely inclose the top of said vessel A.

My said cistern is usually arranged at the top of the building, in communication with the distributing-pipes through which the carbonate passes and supi'ily-pipes through which the water passes, to be received in said cistern preparatory to a final discharge in the proper receivers thereof.

The operation of these parts is, therefore, as follows: The carbonate-dust, when carried off the reel, elevator, conveyer-rolls, or other separator device, and raken by the fan, is forced or carried through. the rising pipe I into the blasttub B, At the same time the Weight of the water from the supply-pipe I causes, by its pressure, the water-mill F to rotate and distribute the Water through the arm ends f2, so as to Wet said carbonate in its passage through the pipe D to the Water-tanks.

It will be observed that the perforated sides or screen-doors E of the blast-tub B will al- Ways remains open, the dash ofthe Water sufiicently preventing any choking action of the carbonate-dust, and that any surplus water and carbonate entering the exterior tub, A, is readily discharged through the pipe C into the, series of tubs as final receivers.

Having thus fully described my said invention, what I claim isl I l. A cistern consisting of tubs A and B, when constructed and arranged one within the other, substantially as and for the purpose set forth.

2. The arrangement of the blast-tub B, slidin g screens E, reaction Water-mill F, cover G, hinged doors H, when combined with the exterior tub, A, having rim-flanges h, and cloth covering h', substantially as set forth.

In testimony of said invention I have hereunto set my hand in presence of- CHAS. W. DWELLE. 

